Miami ADUs are subject to Miami-Dade County impact fees (roads, schools, parks, police, fire) tied to the new dwelling unit, plus City of Miami building permit and plan-review fees. The County's impact fee schedule is set in Miami-Dade Code Chapter 33E. Florida law caps annual increases to county impact fees.
Florida authorizes local governments to impose impact fees on new development under FL Statute Β§163.31801 (the Florida Impact Fee Act). Miami-Dade County maintains an impact fee schedule under Miami-Dade Code Chapter 33E that applies to new construction within the County β including ADUs in incorporated Miami. Categories include Road Impact Fee, Educational Facilities Impact Fee (Miami-Dade Public Schools), Park Impact Fee, Police Impact Fee, and Fire/Rescue Impact Fee. Rates vary by Benefit District and dwelling type; ADU fees are typically charged at a reduced 'multi-family' or 'small accessory unit' rate, but applicants should verify with the Miami-Dade Impact Fee Office. The City of Miami also charges its own building permit and plan-review fees under City Code Chapter 10. FL Β§163.31801(6) caps annual impact fee increases to inflation-adjusted ranges (no more than 50% over a four-year period without a demonstrated-need study). Permit applicants should obtain a written impact-fee estimate before pulling the permit; the County issues a Tax Receipt for impact fees that must accompany the City building permit application.
Building permit will not be issued without proof of impact fee payment. Construction without permits exposes the project to permit-after-the-fact at double fees, and the County may file a lien for unpaid impact fees against the parcel.
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